Mitsubishi Colt Ralliart. Manual - part 730

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-245

Inspection Procedure 4: Starting Impossible (No Initial Combustion)

OFF

ON

M

AK600524

1

1

19

21

20

18

17

16

15

14

1213

11

8 9

L

10

37
52 53 54 555657585960616263646566

38 39 404142434445464748495051

22 23 24 252627282930313233343536

7

5

3

1

6

4

2

2 1

1 2 3
4 5 6

3

1

2

4

R

IG2

ST

LOCK

ACC

IG1

Ignition switch

B-141

5

B-Y

B-129

6

1

2

J/B

B-Y

B-Y

Starter
relay

Clutch
switch

B-109

R-W

B-R

B-R

B-R

B-112

2

29

1

A-17

9

39

1

B-105

3

4

B

B

A-114

Engine-ECU

AB

Starter

1

1

A-124

A-125

OFF

ON

B-60

MU801670

OFF

ON

Battery

Wire colour code
B: Black  LG: Light green  G: Green  L: Blue  W: White  Y: Yellow  SB: Sky blue  BR: Brown  O: Orange  GR: Gray
R: Red  P: Pink  V: Violet  Pu: Purple

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-246

OPERATION

• When the ignition switch is turned to the "START" 

position and the clutch switch is in ON position 
(the clutch is depressed), the starter relay turns 
on.

• If the ignition switch is turned to "START" posi-

tion, battery voltage is applied to the starter (Ter-
minal No.1) through the starter relay.

• If the ignition switch is tuned to "START" position 

battery voltage is applied to engine-ECU (termi-
nal No.39) from ignition switch. Because of this, 
engine ECU detects that the engine is cranked.

COMMENT ON TROUBLE SYMPTOM

• Failure is possibly caused by failed starter itself 

or failed related circuit.

PROBABLE CAUSE

• Failed battery

• Failed starter motor

• Open/short circuit in starter associated circuit or 

loose connector contact

DIAGNOSIS PROCEDURE

STEP 1. Check battery voltage.

• Measure battery voltage at cranking.

OK: 8 V or higher

Q: Is the check result normal?

YES : 

Go to Step 2 .

NO : 

Check battery (Refer to GROUP 54A 

− 

Battery 

− On-vehicle Service − Battery Test 

P.54A-5

).

STEP 2. M.U.T.-III data list

• Item 18: Cranking signal

OK: 

ON (Ignition switch: ST)
OFF (Ignition switch: ON)

Q: Is the check result normal?

YES : 

Go to Step 17 .

NO : 

Go to Step 3 .

STEP 3. Connector check: C-105 starter relay 
connector

Q: Is the check result normal?

YES : 

Go to Step 4 .

NO : 

Repair or replace.

STEP 4. Check starter relay.

• Check starter relay (Refer to GROUP 16 − Start-

ing system 

− Starter relay check 

P.16-21

). 

Q: Is the check result normal?

YES : 

Go to Step 5 .

NO : 

Replace starter relay.

STEP 5. Perform voltage measurement at B-105 
starter relay connector.

• Disconnect connector, and measure at the har-

ness side.

• Ignition switch: ST

• Voltage between terminal No. 1, 3 and earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 8 .

NO : 

Go to Step 6 .

AK600403

3

2

1

4

AC

Connector: B-105

B-105

Harness side
connector

AK600403

3

2

1

4

AC

Connector: B-105

B-105

Harness side
connector

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-247

STEP 6. Connector check: B-141 ignition switch 
connector

Q: Is the check result normal?

YES : 

Go to Step 7 .

NO : 

Repair or replace.

STEP 7. Check ignition switch.

• Check ignition switch (Refer to GROUP 54 − Igni-

tion Switch 

− Ignition Switch − Inspection 

P.54A-27

).

Q: Is the check result normal?

YES : 

Check intermediate connector B-129, and 

repair if necessary. If intermediate 
connector is normal, check and repair 
harness between B-141 (terminal No. 5) 
ignition switch connector and B-105 starter 
relay connector. 

• Check power supply line for 

open/short circuit. 

NO : 

Replace ignition switch.

STEP 8. Connector check: B-60 clutch switch 
connector

Q: Is the check result normal?

YES : 

Go to Step 9 .

NO : 

Repair or replace.

STEP 9. Check clutch switch.

• Check clutch switch (Refer to GROUP 21 − 

Clutch pedal check).

Q: Is the check result normal?

YES : 

Go to Step 10 .

NO : 

Replace clutch switch. 

AK402054

B-141

AC

Connector: B-141

1

2

3

4

5

6

B-141 Harness
side connector

AK402054

B-141

AC

Connector: B-141

1

2

3

4

5

6

B-141 Harness
side connector

AK600403

3

2

1

4

AC

Connector: B-105

B-105

Harness side
connector

AK600404

2 1

AC

Connector: B-60

B-60

Harness side
connector

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-248

STEP 10. Perform voltage measurement at B-60 
clutch switch connector.

• Disconnect connector, and measure at the har-

ness side

• Ignition switch: ST

• Voltage between terminal No. 2 and earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 11 .

NO : 

Check intermediate connector B-112, and 

repair if necessary. If intermediate 
connector is normal, check and repair 
harness between B-105 (terminal No. 2) 
starter relay connector and B-60 (terminal 
No. 2) clutch switch connector. 

• Check power supply line for 

open/short circuit.

STEP 11. Perform resistance measurement at 
B-60 clutch switch connector.

• Disconnect connector, and measure at the har-

ness side.

• Resistance between terminal No. 1 and earth.

OK: Continuity (2

Ω or less)

Q: Is the check result normal?

YES : 

Go to Step 12 .

NO : 

Check and repair harness between B-60 

(terminal No. 1) clutch switch connector and 
body earth. Check earth line for open circuit 
and damage.

• Check earth line for open circuit and 

damage.

AK600404

2 1

AC

Connector: B-60

B-60

Harness side
connector

AK600403

3

2

1

4

AC

Connector: B-105

B-105

Harness side
connector

AK600404

2 1

AC

Connector: B-60

B-60

Harness side
connector

Main

Index

Group

TOC